usb: mtu3: flush cache for the first GPD when allocate GPD ring
When allocate the GPD ring, and tell its address to the controller, then
the driver starts or resumes the QMU, the controller will try to access
the first GPD, so need flush the first one to avoid wrong GPD status.
diff --git a/drivers/usb/mtu3/mtu3_qmu.c b/drivers/usb/mtu3/mtu3_qmu.c
index 95eaf6d..e8dc009 100644
--- a/drivers/usb/mtu3/mtu3_qmu.c
+++ b/drivers/usb/mtu3/mtu3_qmu.c
@@ -112,6 +112,7 @@
memset(gpd, 0, QMU_GPD_RING_SIZE);
ring->dma = (dma_addr_t)gpd;
gpd_ring_init(ring, gpd);
+ mtu3_flush_cache((uintptr_t)gpd, sizeof(*gpd));
return 0;
}